diff --git a/frontend_tests/node_tests/components.js b/frontend_tests/node_tests/components.js
index ee96497e06..9d093ac8d5 100644
--- a/frontend_tests/node_tests/components.js
+++ b/frontend_tests/node_tests/components.js
@@ -124,7 +124,7 @@ run_test('basics', () => {
 
     var callback_value;
 
-    var widget;
+    let widget = null;
     widget = components.toggle({
         selected: 0,
         values: [